. >> reporter: president obama joe biden was sworn in today by sonya society meyer -- sonya sotomayor. this ceremony was small and private. both being sworn in on the steps. covering all the knowledge for you with chris chris. >> that's right. we're just hours away and thousands of security officers will be out waiting to welcome about 700,000 people expected to cram the mall watching president obama make history the second time around. president obama wrapped up his second term in washington. >> after we celebrate. let's make sure we work as hard as we can to pass on an america. also in our feature future. >> the institution of the united states -- the constitution of the united states. >> it was over in less than a minute. they require the swearing in on the 20th of january because the day where they will do it again for the public. on the national mall, security is set along with miles of sensing. >> you can see the preparations here on the national mall and here behind me, they will be having that happen for the inaugural ceremony. >> reporter: they won't be as big as the one to f